Luke 1:19-20

19-20But the angel said, "I am Gabriel, the sentinel of God, sent especially to bring you this glad news. But because you won't believe me, you'll be unable to say a word until the day of your son's birth. Every word I've spoken to you will come true on time—God's time."

21-22Meanwhile, the congregation waiting for Zachariah was getting restless, wondering what was keeping him so long in the sanctuary. When he came out and couldn't speak, they knew he had seen a vision. He continued speechless and had to use sign language with the people.